Question

The fluid that is moved by the circulatory system of a typical arthropod (i.e., insect/spider) is _____________                i.  under relatively low pressure compared to fluid in the circulatory system in a mammal (i.e.,YOU).                ii. called hemolymph.                iii. carrying O2.                                            iv. in direct contact with the tissues of the arthropod.

Answers: a. None of the answers above are correct. b. Exactly ONE (1) of the answers above is correct. c. Exactly TWO (2) of the answers above are correct. d. Exactly THREE (3) of the answers above are correct. e. All FOUR of the answers above are correct.

Answer 1

The fluid circulated in thebody of arthropods is called haemolymph.and is analogous to blood in vertebrates. It consists of fluid plasma in which hemocytes and many chemial substances are suspended. Since arthropods have characteristic open circulatory system, the hemolymph is in direct contact with the tissues and thus all the tissues and organs directly bathe in thefluid. It also transports oxygen via hemocyanin proteins that are copper binding metalloprotein, containing2 copper atoms that reversibly bind a single oxygen molecule (O2). Unlike the hemoglobin in red blood cells found in vertebrates, hemocyanins are not bound to blood cells but are instead suspended directly in the hemolymph.

Option d.

Exactly THREE (3) of the answers above are correct.